Series 70: eSTS 150A-800A
Series 70: eSTS 1200A-4000A
Series 70: ePODs™ Type-P
Series 70: ePODs™ Dual Type-P
Series 70: ePODs™ Type-S
Series 70: ePODs™ Type-N
Series 70: ePODs™ Type-X
Series 70: eRPPs
Series 70: ePanel-1
Series 70: ePanel-2
Series 70: ePanel-HD
Providing High-Reliablility Transfers Between Independent Power Sources
LayerZero Power Systems was patented the technology for a source transfer invention utilized by the company's Static Transfer Switches, to automatically compensate for differences in phases between sources, eliminating downstream transformer inrush from out-of-phase transfers. The innovative invention operates by introducing an appropriate time delay during the transfer, the duration of the delay is a function of the phase angle between the two sources at the instant of transfer.
The phase of the voltage waveform from each power source is sensed continuously, and the phase difference is known at all times, so that it can be used when the transfer is necessary. The method and apparatus monitors the voltage from the first power source, and initiates the transfer from the first power source to the second power source in response to an unacceptable condition from the first power source. The second power source is connected only after waiting for a period of time corresponding to the appropriate time delay.
When Source 1 and Source 2 are out of phase and the transfer switch performs a ¼ cycle transfer, the transformer is already magnetized.
The magnetic flux of the transformer must be balanced going from one source to another. Nothing could be simpler than a time delay that stays inside of the CBEMA curve. Below are sample waveforms from out-of-phase transfers.
Learn more about Voice Guided Bypass |
|
